Open In App

Difference Between Modulation and Demodulation

Last Updated : 28 Feb, 2024
Improve
Improve
Like Article
Like
Save
Share
Report

Modulation and demodulation are components of modems that convert analog signals to digital signals and vice versa. The process of converting digital to analog is known as modulation, and the reverse of modulation is known as demodulation. Analogue signals are continuous, whereas digital signals are discrete, or change abruptly. In this article, we will explain modulation and demodulation, as well as the differences between them.

What is Modulation?

The method of converting information to signal for transferring the digital signals over an electronic medium. In terms of computer networks, we say that the conversion of digital to analog signals. The frequency transmission in modulation goes from low to high.

for example- a TV without a setup box in that case TV operates through the operator. The other example is that we all use microphones to record the audio clip the voice used in audio is human voice which is in the form of Analog signals, the computer converts the human voice into the digital signal and vice-versa. In simple words, we say that modulation is the method of superimposing high frequency to low frequency.

Working of Modulation

Modulation

fig: Modulation

The working of modulation is the method of superimposing high frequency over low frequency. The circuit we used in the modulation is the modulator. In modulation, they have carrier signals and modulated signals. In carrier signal, the signal contains no information but they have a phase, amplitude, and frequency. In modulated signal, it is the combination of Carrier signal and modulation.

Types of Modulation

1. Amplitude Modulation: This modulation technology is to transfer voice over radio. It occurs when the carrier signal is changed but phase and frequency stay constant.

2. Phase Modulation: In phase modulation, the frequency is directly proportional to the Phase. When there is a fluctuation in Phase, the frequency also reflects variation.

3. Frequency Modulation: In Frequency modulation, the frequency of the carrier signal is changed while the phase and amplitude of the signal are not changed.

Advantages of Modulation

  • It reduces the height of the Antenna.
  • In modulation, there is no mixing of signal.
  • It provides flexibility for adjusting the bandwidth.
  • It enhance the range of communication.
  • It reduces noise transmission.
  • Modulation is transmission efficient that means signal transmit over long distance.

Disadvantages of Modulation

  • Modulation have complexity issues.
  • The equipment cost is more.
  • It is not useful for high bandwidth.
  • There is a loss of power.

What is Demodulation?

The method of extracting the data from modulation is called demodulation. It recovers the signal that is generated from the modulated signal. It generated the output in the form of sound waves, pictures, and binary data. The other definition we say in terms of computer network is the conversion of analog signal to digital signal. The frequency transmission in demodulation going from high to low. for example, The TV with a set-top box in the case set-top box operates the TV.

Working of Demodulation

Demodulation

fig: Demodulation

The working of demodulation is the process of recovery of the information that is generated from the modulated wave. The circuit demodulator is used in the block diagram of demodulation. In demodulation, the receiver receives the signal in modulation through the receiver Antenna then recovers the data by using a demodulator and gives the output in the form of sound.

Types of Demodulation

1. Amplitude Modulation: In Amplitude modulation, we used rectifiers to demodulate the signal that is generated from the modulation signal.

2. Frequency Modulation: In Frequency modulation, we know that the frequency modulation of the carrier signal is changed while the phase and amplitude of the signal are not changed after that demodulation technique recovers the original signal that is generated from the modulated wave. In that case, we use Phase-locked loops for demodulation.

3. Phase Modulation: We learned in phase modulation, the frequency is directly proportional to the Phase. When there is a fluctuation in Phase, the frequency also reflects variation after that demodulation technique recovers the original signal that is generated from the modulated wave. In that case, we use a Phase detector for demodulation.

Advantages of Demodulation

  • It helps to improve the original signal.
  • It improve the Amplitude, frequency and phase modulation signals.
  • Demodulation improve the signal reliability.

Disadvantages of Demodulation

  • Demodulation have high power consumption.
  • It is a complex process.
  • The equipment cost is expensive.

Diference Between Modulation and Demodulation

Aspects

Modulation

Demodulation

Define

The method of converting information to signal for transferring the digital signals over electronic medium.

The method of extracting the data from modulation called demodulation.

Ends

Modulation is connected from transmitting end.

Demodulation is connected from Receiving end.

Conversion of Signals

Modulation converts digital signal to analog signal.

Demodulation converts analog signal to digital signal.

Transmission of Frequency

The transmission of frequency in modulation goes low to high.

The transmission of frequency in demodulation goes high to low.

In terms of Complexity

Modulation is less complex or we can say it’s a simple process

Demodulation is a more complex process.

Signal Transmission

In modulation, the signal transmission goes low to high.

In demodulation, the signal transmission goes high to low.

Circuit used

In modulation, the circuit used is modulator

In demodulation, the circuit used is demodulator.

Frequently Asked Questions on Modulation and Demodulation – FAQs

What is Modulation and Demodulation?

The conversion of digital signal to analog signal is known as Modulation while the reverse of modulation is known as demodulation. In modulation, the modulator is connected at the transmission end, and in demodulation, the demodulator is connected at the receiver’s end. The modulator and demodulator are the circuits in modulation and demodulation.

Which device is used for modulation and demodulation?

The modem is the device that is used for modulation and demodulation. Modem is the process of converting analog signal to digital signal and vice versa. It can modulate and demodulate the signals of each other.

What is the difference between Modulation and Demodulation?

The difference between modulation and demodulation is that modulation is connected at the transmission end while demodulation is connected at the receiver’s end. The transmission of frequency in modulation goes low to high while the transmission of frequency in demodulation goes high to low.

What are the benefits of Modulation and Demodulation?

Benefits of Modulation:

  • It decrease the size of the Antenna.
  • In modulation, there is no mixing of signal.
  • It provides flexibility for adjusting the bandwidth.

Benefits of Demodulation:

  • It helps to improve the original signal.
  • It improve the Amplitude, frequency and phase modulation signals.
  • Demodulation improve the signal reliability.

Why we need Modulation and Demodulation?

Because Modulation goes from a longer distance that means there is no requirement of wires in the communication systems. It makes the human wireless. Nowadays we see that the telephone is not plugged into our home wall. The requirement of demodulation helps to recover the original signal that is generated from the modulated signal.



Previous Article
Next Article

Similar Reads

Difference between Pulse Code Modulation (PCM) and Delta Modulation (DM)
PCM stands for Pulse Code Modulation and DM stands for Delta Modulation. PCM is basically used for reworking analog to digital signals and DM is a conversion technique between analog and digital signals. In this article, we will discuss these two topics and also see the differences between these PCM and DM. Pulse Code Modulation (PCM)Pulse Code Mod
3 min read
Difference between Delta Modulation (DM) and Differential Pulse Code Modulation (DPCM)
Delta Modulation (DM): Delta modulation is associated with analog-to-digital and digital-to-analog signal conversion techniques. Delta modulation is utilized to appreciate high signal-to-noise magnitude relation. It uses one-bit PCM code to appreciate the digital transmission of the analog signal. With delta modulation, rather than transmitting a c
2 min read
Quadrature Amplitude Modulation
Quadrature Amplitude Modulation (QAM) is a modulation technique that can be utilized in Analog modulation concepts and digital modulation concepts. It is a combination of ASK and PSK. So, in this article, we will discuss QAM, Analog QAM, Digital QAM, and many more. Quadrature Amplitude Modulation:Quadrature Amplitude Modulation (QAM) can be defined
5 min read
What is Modulation?
Modulation can be digital or analog, the input wave of the analog signal varies continuously like a sine wave. Modulation can be defined as the process of converting data into waves by adding information to a carrier signal. Such a signal can be transmitted electronically or optically, but it must have a consistent waveform. What is Modulation?The
5 min read
Why Modulation is Important to Reduce Height of Antenna?
Answer: Modulation is important for reducing the height of antennas primarily because it allows for the efficient transmission of signals over long distances while minimizing the physical size of the antenna required. Modulation is important for reducing the height of an antenna for a few key reasons: Frequency Utilization: In modulation, these cha
2 min read
How Modulation is Done ?
Answer: Modulation is achieved by superimposing the baseband signal onto a carrier signal. The carrier signal typically has a much higher frequency than the baseband signal and serves as a medium for transmitting the information over a communication channel.Types of Modulation Amplitude Modulation (AM): In amplitude modulation, amplitude of the car
2 min read
Difference between Stop and Wait protocol and Sliding Window protocol
Introduction: Both Stop and Wait protocol and Sliding Window protocol are the techniques to the solution of flow control handling. The main difference between Stop-and-wait protocol and Sliding window protocol is that in Stop-and-Wait Protocol, the sender sends one frame and wait for acknowledgement from the receiver whereas in sliding window proto
4 min read
Difference Between Store‑and‑Forward Switching and Cut‑Through Switching
Switching is a technique that is used to transmit data between the networks. It is achieved by using switches that are used to connect multiple LAN networks. Switches forward the data packets based on their MAC addresses. Switching is used to efficiently utilize the bandwidth of the network and reduce the collisions between the packets. Switching t
5 min read
Difference between sh and bash
bash and sh are two different shells of the Unix operating system. bash is sh, but with more features and better syntax. Bash is “Bourne Again SHell”, and is an improvement of the sh (original Bourne shell). Shell scripting is scripting in any shell, whereas Bash scripting is scripting specifically for Bash. sh is a shell command-line interpreter o
4 min read
What’s difference between The Internet and The Web ?
Do many folks consider that they both are the same but are they really the same? The Internet is a global network of networks while the Web, also referred to formally as World Wide Web (www) is a collection of information that is accessed via the Internet. Another way to look at this difference is; the Internet is infrastructure while the Web is se
2 min read
Article Tags :